The 535i that I'm parting out has a Mickey Mouse exhaust on it. That is- someone has removed the catalytic converter and welded straight pipes back to a single rear muffler with a 2 pipe in 1 pipe out configuration. It does not appear to have been done that long ago, as the pipes and muffler are rust free and look new. If you're interested in it, I'll sell you the whole thing for $45 plus shipping. I have no use or interest in it.